in the extension use 'connect my wallet' -> NWC -> and paste this string:

nostr+walletconnect://cec45ff9e9302f65fdb67597e4953c30f979e761e95f575c3941ef2d6fda2893?relay=wss://relay.getalby.com/v1&secret=2f26defe4aae10ed517b05eadbed1fd7740160e58d9801af5664d2231602a15b&lud16=7e4ff2@nwc-mint.fly.dev

It will let you use my node, so you could use the extension for Nostr. But don't trust me and don't keep many funds there!